Triple Offset Butterfly Valve – High Temperature / High Pressure

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Triple offset (triple eccentric) metal-seated butterfly valve

Offset Geometry

Three offsets: axial, radial, and angular (elliptical seat geometry) – ensures frictionless operation with sealing only at point of closure

Sealing Principle

Torque-seated metal-to-metal sealing; bidirectional zero leakage (ANSI Class VI bubble-tight)

Connection Type

Double flanged (long pattern) – ASME B16.5 / B16.47 compliant

Flow Direction

Fully bidirectional

Seat Design

Laminated metal seal (multi-layer 304 stainless steel + graphite) or full Stellite hardfacing

Stem Design

Anti-blowout stem with externally retained gland design per API 609 Category B

Stem Sealing

Flexible graphite packing in extended stuffing box, self-sealing gland, anti-blowout design

Actuator Mounting

ISO 5211 top mounting flange

Fire-safe

Inherently fire-safe design (metal-to-metal sealing); optional API 607 / 6FA certification

Maintenance

Adjustable stem packing with easy access without actuator removal

デザイン

Cast or welded integral cooling fins on upper body neck / bonnet extension

Function

Block heat bridge; dissipate heat from line media before reaching packing and actuator

材料

Carbon steel or stainless steel (matching body material)

Benefit

Enables continuous operation at media temperatures up to 650°C (1200°F)while maintaining safe packing/actuator temperatures

サイズ

24 inches (DN600)

圧力定格

Class 600LB (PN100)

Design Standard

API 609 (Category B), ASME B16.34, BS EN 593

Face-to-Face Dimensions

API 609 / ASME B16.10 / ISO 5752 Series 13 & 20

Flange Connection

ASME B16.5 (RF or RTJ)

End Connections

Double flanged (long pattern)

Top Flange

ISO 5211

Maximum Working Pressure

10.0 MPa (100 bar) / Class 600

Maximum Media Temperature (with cooling fins)

Up to 650°C (1200°F)

Standard Temperature Range

-46°C to +425°C

Extended Temperature Range

Up to +538°C (with suitable materials); up to +700°C with special alloys

Applicable Media

Steam, high-temperature oil, high-temperature flue gas, thermal fluid, superheated water, process gases

体

WCB (Carbon Steel, ASTM A216 Gr. WCB)

WC9 (Cr-Mo steel, high temp), CF8 (304 SS), CF8M (316 SS), LCB/LCC (low temp), Alloy 20, Duplex / Super Duplex

ディスク

WCB / Carbon Steel

304 SS, 316 SS, Alloy Steel (high-temp grade), Duplex SS

Stem / Shaft

2Cr13 Stainless Steel

17-4PH, Inconel (high-temp high-strength), 304 SS, 316 SS, XM-19

Seat / Seal Face

Multi-layer metal seal (304 SS + graphite)

Full Stellite hardfacing (wear & erosion resistant), Inconel overlay

Bushing / Bearing

Self-lubricating metal-graphite (high temp)

High-temp alloy + solid lubricant coating

Packing / Gasket

Flexible graphite (high temp)

Ceramic fiber + graphite combination (ultra-high temp)

Cooling Fin Material

Carbon steel (matching body)

Stainless steel

Bolting

Alloy steel / stainless steel

NACE MR 01-75 compliant

Body Shell Test

API 598

1.5 × rated pressure

Seat Leak Test

API 598 / ANSI/FCI 70-2

Bidirectional zero leakage; ANSI Class VI (bubble-tight)

Pressure-Temperature Rating

ASME B16.34

Per class rating chart

Fire-safe Test

API 607 / API 6FA (optional)

Inherently fire-safe (metal seat)

Fugitive Emissions

ISO 15848

< 50ppm

NACE Compliance

MR 01-75 / ISO 15156 (optional)

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Flow Characteristic

Approximate equal percentage

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Rangeability

30:1 to 100:1

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サイズ

24″ (DN600)

Face-to-Face (Long Pattern)

Per API 609 / ASME B16.10

Flange Standard

ASME B16.5 Class 600 RF / RTJ

Flange Bolt Circle

Per ASME B16.5

Number of Bolt Holes

Per ASME B16.5

Overall Height (incl. cooling fins)

To be confirmed by manufacturer

Approx. Weight

Consult manufacturer

Manual

Handwheel with worm gear operator

Pneumatic

Double-acting or spring-return

Electric

On-off or modulating

Electro-hydraulic

For high-torque requirements

Mounting

ISO 5211 top flange

Zero Friction Operation

Triple offset design eliminates seat rubbing; sealing only at point of closure

Extended Service Life

No galling or scratching of sealing surfaces; high cycle life

Bidirectional Shut-off

Fully bi-directional bubble-tight sealing

High Temperature Capability

Up to 650°C with cooling fins

Low Operating Torque

Reduced actuator size and energy consumption

Thermal Cycling Resistance

Continued seal integrity through thermal cycling

Inherently Fire-safe

Metal-to-metal sealing provides fire-safe design without additional soft seals

Fugitive Emission Control

< 50ppm; ISO 15848 compliant

Body Materials

WCB, WC6, WC9, CF8, CF8M, LCB, LCC, Duplex, Super Duplex, Inconel, Hastelloy

Seat Hardfacing

Stellite, Inconel, Colmonoy

End Connections

Double flanged (standard), butt-weld, lug, wafer

対面

Short pattern or long pattern (gate valve replacement)

Actuator

Manual gear, pneumatic, electric, electro-hydraulic

Fire-safe Certification

API 607 / API 6FA

Fugitive Emission

ISO 15848 certified

NACE

MR 01-75 / ISO 15156 compliant materials

Special Cleaning

For oxygen service or ultra-pure applications

API 609

Butterfly Valves: Double-Flanged, Lug- and Wafer-Type (Category B)

ASME B16.34

Valves — Flanged, Threaded, and Welding End

ASME B16.10

Face-to-Face and End-to-End Dimensions

ASME B16.5

Pipe Flanges and Flanged Fittings (up to 24″)

ASME B16.47

Large Diameter Steel Flanges

API 598

Valve Inspection and Testing

ANSI/FCI 70-2

Control Valve Seat Leakage

ISO 5752

Face-to-Face Dimensions

BS EN 593

Industrial Valves — Butterfly Valves

API 607 / API 6FA

Fire-safe Testing (optional)

ISO 15848

Fugitive Emissions (optional)

NACE MR 01-75

Sulfide Stress Cracking Resistant Materials (optional)